[Bug 205002] pmcstat cannot track thread ids

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205002

            Bug ID: 205002
           Summary: pmcstat cannot track thread ids
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: jason at eggnet.com

Currently pmcstat cannot track thread IDs:

# ps -auxwwH -O lwp,comm | grep init
root       1  0.0  0.0    9476     248  -  SLs  25Nov15     0:01.03 /sbin/init
--        1 100002 init                    -  SLs      0:01.03 /sbin/init --

this is of course pid 1, but thread id 100002

# pmcstat -t 100002 -P unhalted-cycles -O /dev/null
pmcstat: ERROR: No processes were attached to.

When debugging multithreaded applications it can be beneficial to focus on
specific threads, if different threads are performing different types of tasks.

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